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公开(公告)号：US06272196B1
公开(公告)日：2001-08-07
申请号：US08798686
申请日：1997-02-12
IPC分类号： H04L2300
CPC分类号： G10L19/12 , G10L2019/0013
摘要： In a CELP coder, a comparison between a target signal and a plurality of synthetic signals is made. A synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal, which results in a minimum error between the target signal and the synthetic signal, is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity, a preselection of a small number of excitation sequences is made by selecting a small number of excitation sequences resembling the most backward filtered target signal. With this small number of excitation sequences a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对多个激励序列进行滤波而导出合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 搜索最佳激励信号需要大量的计算复杂度。 为了降低复杂度，通过选择少数类似于最后向滤波的目标信号的激励序列来进行少量激励序列的预选。 利用这种少量的激励序列，进行完全复杂的搜索。 由于在最终选择中涉及的激励序列数量减少，所需的计算复杂度降低。
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公开(公告)号：US06600798B2
公开(公告)日：2003-07-29
申请号：US09761196
申请日：2001-01-16
IPC分类号： H04L2300
CPC分类号： G10L19/12 , G10L2019/0013
摘要： In a CELP coder, a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and synthetic signal is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity, a preselection of a small number of excitation sequences is made using a reduced complexity synthesis filter. With this small number of excitation sequences, a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection, the required computational complexity is reduced.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对多个激励序列进行滤波而导出合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 搜索最佳激励信号需要大量的计算复杂度。 为了降低复杂度，使用降低复杂度的合成滤波器来进行少量激励序列的预选。 利用这种少量的激励序列，进行完全复杂的搜索。 由于最终选择中所涉及的激励序列数量减少，所需的计算复杂度降低。
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公开(公告)号：US06608877B1
公开(公告)日：2003-08-19
申请号：US09710820
申请日：2000-11-13
IPC分类号： H04L2300
CPC分类号： G10L19/12 , G10L2019/0013
摘要： In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity a preselection of a small number of excitation sequences is made by selecting a small number of excitation sequences resembling the most a backward filtered target signal. With this small number of excitation sequences a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对多个激励序列进行滤波而导出合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 搜索最佳激励信号需要大量的计算复杂度。 为了降低复杂度，通过选择少量的类似于反向滤波的目标信号的激励序列来进行少量激励序列的预选。 利用这种少量的激励序列，进行完全复杂的搜索。 由于在最终选择中涉及的激励序列数量减少，所需的计算复杂度降低。
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4.发明授权CELP coding with two-stage search over displaced segments of a one-dimensional codebook 有权通过对一维码本的位移段进行两级搜索的CELP编码公开(公告)号：US06603832B2
公开(公告)日：2003-08-05
申请号：US09761197
申请日：2001-01-16
IPC分类号： H04L2300
CPC分类号： G10L19/12 , G10L2019/0013
摘要： In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences from a one dimensional codebook by a synthesis filter having parameters derived from the target signal. The excitation signal that results in a minimum error between the target signal and the synthetic signal is selected. In order to reduce the complexity of the search for the best excitation signal, the selection is done in two stages. First a preselection of a small number of excitation sequences is made by selecting only every L.sup.th codebook entry for preselecting a plurality of excitation sequences. Thereafter, with this small number of excitation sequences, a fill complexity search is made in which all excitation sequences surrounding the preselected ones are involved in the selection.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对来自一维码本的多个激励序列进行滤波，得到合成信号。 选择导致目标信号与合成信号之间的最小误差的激励信号。 为了降低寻找最佳激励信号的复杂度，选择分两个阶段完成。 首先，通过仅选择每个L.sup.th码本条目来预选多个激励序列来进行少量激励序列的预选择。 此后，利用这种少量的激励序列，进行填充复杂度搜索，其中围绕预选的激励序列参与选择。
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公开(公告)号：US6014619A
公开(公告)日：2000-01-11
申请号：US798889
申请日：1997-02-11
CPC分类号： G10L19/12
摘要： In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. In order to reduce the complexity of the search for the best excitation signal, thee selection is done in two stages. First a preselection of a small number of excitation sequences is made using a reduced complexity synthesis filter. Thereafter, with this small number of excitation sequences, a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对多个激励序列进行滤波而导出合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 为了降低寻找最佳激励信号的复杂度，选择分为两个阶段。 首先，使用降低复杂度的合成滤波器来进行少量激励序列的预选。 此后，利用这个少量的激励序列，进行完全复杂的搜索。 由于在最终选择中涉及的激励序列数量减少，所需的计算复杂度降低。
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6.发明授权
公开(公告)号：US5943646A
公开(公告)日：1999-08-24
申请号：US818145
申请日：1997-03-13
CPC分类号： G10L19/06
摘要： In a transmission system a signal is encoded in an encoder (7) and the encoded signal is transmitted by a transmitter (2) via a transmission medium (4) to a receiver (6). In the encoder, analysis parameters of the input signal are determined by an analyzer (8) and quantized by a quantizer (14). The transmitter transmits quantization level numbers to the receiver (6), and in the receiver decoded analysis parameters are derived by interpolating level numbers of two subsequent sets of analysis parameters, and subsequently determining the corresponding analysis. By interpolating the level numbers instead of the analysis parameters themselves, a substantial amount of computational complexity is saved.
摘要翻译： 在传输系统中，信号被编码在编码器（7）中，编码信号由发射机（2）通过传输介质（4）传输到接收机（6）。 在编码器中，输入信号的分析参数由分析器（8）确定并由量化器（14）量化。 发射机向接收机（6）发送量化级别号码，并且在接收机中解码的分析参数是通过内插两组后续的分析参数的级数导出的，随后确定相应的分析。 通过内插等级数而不是分析参数本身，可以节省大量的计算复杂度。
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7.发明授权CELP coding with two-stage search over displaced segments of a one-dimensional codebook 失效通过对一维码本的位移段进行两级搜索的CELP编码
公开(公告)号：US5920832A
公开(公告)日：1999-07-06
申请号：US798677
申请日：1997-02-12
CPC分类号： G10L19/12
摘要： In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences from a one dimensional codebook by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. In order to reduce the complexity of the search for the best excitation signal, the selection is done in two stages. First a preselection of a small number of excitation sequences is made by selecting only every L.sup.th codebook entry for preselecting a plurality of excitation sequences. Thereafter, with this small number of excitation sequences, a full complexity search is made in which all excitation sequences surrounding the preselected ones are involved in the selection.
摘要翻译： 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对来自一维码本的多个激励序列进行滤波，得到合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 为了降低寻找最佳激励信号的复杂度，选择分两个阶段完成。 首先，通过仅选择每个第L个码本条目来预选择多个激励序列来进行少量激励序列的预选择。 此后，利用这种少量的激励序列，进行全复杂度搜索，其中围绕预选的所有激励序列参与选择。
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